Periodical Sets: What Should You Buy?

When I consider the World list of scientific periodicals, or the array of slips which we hope will one day be published as the British union catalogue of periodicals, and then turn to look at the few journals on my library shelves, I feel rather as Newton did: like a child, playing with a few pebbles on the sea‐shore, while the vast ocean of truth lies all undiscovered before me.